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Handle backup transport registration dynamically

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Bug 11369873

Change-Id: I9bbdcc21ce25159c6645690123b5d03c553b0ddc
This commit is contained in:
Christopher Tate
2013-11-14 18:10:35 -08:00
parent a951fa56f1
commit cefba58d14
6 changed files with 124 additions and 43 deletions
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107
services/java/com/android/server/BackupManagerService.java
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@@ -46,6 +46,8 @@ import android.content.pm.IPackageInstallObserver;
import android.content.pm.IPackageManager;
import android.content.pm.PackageInfo;
import android.content.pm.PackageManager;
import android.content.pm.ResolveInfo;
import android.content.pm.ServiceInfo;
import android.content.pm.Signature;
import android.content.pm.PackageManager.NameNotFoundException;
import android.database.ContentObserver;
@@ -146,6 +148,7 @@ class BackupManagerService extends IBackupManager.Stub {
static final boolean COMPRESS_FULL_BACKUPS = true; // should be true in production
static final String SHARED_BACKUP_AGENT_PACKAGE = "com.android.sharedstoragebackup";
static final String SERVICE_ACTION_TRANSPORT_HOST = "android.backup.TRANSPORT_HOST";
// How often we perform a backup pass. Privileged external callers can
// trigger an immediate pass.
@@ -251,10 +254,13 @@ class BackupManagerService extends IBackupManager.Stub {
volatile boolean mClearingData;
// Transport bookkeeping
final HashMap<String,String> mTransportNames
= new HashMap<String,String>(); // component name -> registration name
final HashMap<String,IBackupTransport> mTransports
= new HashMap<String,IBackupTransport>();
= new HashMap<String,IBackupTransport>(); // registration name -> binder
final ArrayList<TransportConnection> mTransportConnections
= new ArrayList<TransportConnection>();
String mCurrentTransport;
IBackupTransport mLocalTransport, mGoogleTransport;
ActiveRestoreSession mActiveRestoreSession;
// Watch the device provisioning operation during setup
@@ -815,13 +821,7 @@ class BackupManagerService extends IBackupManager.Stub {
}
// Set up our transport options and initialize the default transport
// TODO: Have transports register themselves somehow?
// TODO: Don't create transports that we don't need to?
mLocalTransport = new LocalTransport(context); // This is actually pretty cheap
ComponentName localName = new ComponentName(context, LocalTransport.class);
registerTransport(localName.flattenToShortString(), mLocalTransport);
mGoogleTransport = null;
mCurrentTransport = Settings.Secure.getString(context.getContentResolver(),
Settings.Secure.BACKUP_TRANSPORT);
if ("".equals(mCurrentTransport)) {
@@ -829,28 +829,43 @@ class BackupManagerService extends IBackupManager.Stub {
}
if (DEBUG) Slog.v(TAG, "Starting with transport " + mCurrentTransport);
// Attach to the Google backup transport. When this comes up, it will set
// itself as the current transport because we explicitly reset mCurrentTransport
// to null.
ComponentName transportComponent = new ComponentName("com.google.android.backup",
"com.google.android.backup.BackupTransportService");
try {
// If there's something out there that is supposed to be the Google
// backup transport, make sure it's legitimately part of the OS build
// and not an app lying about its package name.
ApplicationInfo info = mPackageManager.getApplicationInfo(
transportComponent.getPackageName(), 0);
if ((info.flags & ApplicationInfo.FLAG_SYSTEM) != 0) {
if (DEBUG) Slog.v(TAG, "Binding to Google transport");
Intent intent = new Intent().setComponent(transportComponent);
context.bindServiceAsUser(intent, mGoogleConnection, Context.BIND_AUTO_CREATE,
UserHandle.OWNER);
} else {
Slog.w(TAG, "Possible Google transport spoof: ignoring " + info);
// Find transport hosts and bind to their services
Intent transportServiceIntent = new Intent(SERVICE_ACTION_TRANSPORT_HOST);
List<ResolveInfo> hosts = mPackageManager.queryIntentServicesAsUser(
transportServiceIntent, 0, UserHandle.USER_OWNER);
if (DEBUG) {
Slog.v(TAG, "Found transports: " + ((hosts == null) ? "null" : hosts.size()));
}
if (hosts != null) {
if (MORE_DEBUG) {
for (int i = 0; i < hosts.size(); i++) {
ServiceInfo info = hosts.get(i).serviceInfo;
Slog.v(TAG, " " + info.packageName + "/" + info.name);
}
}
for (int i = 0; i < hosts.size(); i++) {
try {
ServiceInfo info = hosts.get(i).serviceInfo;
PackageInfo packInfo = mPackageManager.getPackageInfo(info.packageName, 0);
if ((packInfo.applicationInfo.flags & ApplicationInfo.FLAG_PRIVILEGED) != 0) {
ComponentName svcName = new ComponentName(info.packageName, info.name);
if (DEBUG) {
Slog.i(TAG, "Binding to transport host " + svcName);
}
Intent intent = new Intent(transportServiceIntent);
intent.setComponent(svcName);
TransportConnection connection = new TransportConnection();
mTransportConnections.add(connection);
context.bindServiceAsUser(intent,
connection, Context.BIND_AUTO_CREATE,
UserHandle.OWNER);
} else {
Slog.w(TAG, "Transport package not privileged: " + info.packageName);
}
} catch (Exception e) {
Slog.e(TAG, "Problem resolving transport service: " + e.getMessage());
}
}
} catch (PackageManager.NameNotFoundException nnf) {
// No such package? No binding.
if (DEBUG) Slog.v(TAG, "Google transport not present");
}
// Now that we know about valid backup participants, parse any
@@ -1298,13 +1313,16 @@ class BackupManagerService extends IBackupManager.Stub {
// Add a transport to our set of available backends. If 'transport' is null, this
// is an unregistration, and the transport's entry is removed from our bookkeeping.
private void registerTransport(String name, IBackupTransport transport) {
private void registerTransport(String name, String component, IBackupTransport transport) {
synchronized (mTransports) {
if (DEBUG) Slog.v(TAG, "Registering transport " + name + " = " + transport);
if (DEBUG) Slog.v(TAG, "Registering transport "
+ component + "::" + name + " = " + transport);
if (transport != null) {
mTransports.put(name, transport);
mTransportNames.put(component, name);
} else {
mTransports.remove(name);
mTransports.remove(mTransportNames.get(component));
mTransportNames.remove(component);
// Nothing further to do in the unregistration case
return;
}
@@ -1390,18 +1408,23 @@ class BackupManagerService extends IBackupManager.Stub {
}
};
// ----- Track connection to GoogleBackupTransport service -----
ServiceConnection mGoogleConnection = new ServiceConnection() {
public void onServiceConnected(ComponentName name, IBinder service) {
if (DEBUG) Slog.v(TAG, "Connected to Google transport");
mGoogleTransport = IBackupTransport.Stub.asInterface(service);
registerTransport(name.flattenToShortString(), mGoogleTransport);
// ----- Track connection to transports service -----
class TransportConnection implements ServiceConnection {
@Override
public void onServiceConnected(ComponentName component, IBinder service) {
if (DEBUG) Slog.v(TAG, "Connected to transport " + component);
try {
IBackupTransport transport = IBackupTransport.Stub.asInterface(service);
registerTransport(transport.name(), component.flattenToShortString(), transport);
} catch (RemoteException e) {
Slog.e(TAG, "Unable to register transport " + component);
}
}
public void onServiceDisconnected(ComponentName name) {
if (DEBUG) Slog.v(TAG, "Disconnected from Google transport");
mGoogleTransport = null;
registerTransport(name.flattenToShortString(), null);
@Override
public void onServiceDisconnected(ComponentName component) {
if (DEBUG) Slog.v(TAG, "Disconnected from transport " + component);
registerTransport(null, component.flattenToShortString(), null);
}
};